// position 定位类 acss

@include iClass(relative) {
    position: relative;
}

@include iClass(fixed) {
    position: fixed;
}

@include iClass(absolute) {
    position: absolute;
}

// 编译成 [i-class*=xxx] { position: xxx }
// 使用: 元素上添加 i-class 属性， i-class="relative fixed ..."
